What do computer security measures ensure regarding information systems?

The correct answer highlights the essential principles of information security, which are confidentiality, integrity, and availability—commonly known as the CIA triad.

Confidentiality ensures that sensitive information is accessible only to those authorized to have access. This protects against unauthorized disclosure and data breaches. Integrity ensures that data remains accurate and unaltered during storage, transmission, and processing, thus maintaining trust in the information systems. Availability guarantees that information and resources are accessible to authorized users when needed, preventing service outages or downtime.

These three principles form the foundation of effective security measures in any information system, driving their design, implementation, and maintenance. While other aspects, such as high performance, efficiency, user experience, or regulatory compliance, are important, they are not the primary focus of computer security measures. Instead, they may support or enhance the overall effectiveness of those security measures but do not constitute the core objectives.